CAJ | 학술논문

对两种型号的聚丙烯（PP ）双向土工格栅进行相同应力水平条件下的蠕变试验，试验结束后完全卸载并对其收缩情况进行观测。试验结果表明，在蠕变过程中，双向土工格栅试样各部分蠕变发展并不均匀，最终的应变值为4％～5％，与单向土工格栅相比双向土工格栅蠕变速率发展较慢。采用开尔文串联模型对格栅收缩试验过程进行模拟，建立了描述土工格栅粘弹塑性收缩变形的数学方程，并对试验结果进行了拟合，拟合效果良好。
대량충형호적취병희（PP ）쌍향토공격책진행상동응력수평조건하적연변시험，시험결속후완전사재병대기수축정황진행관측。시험결과표명，재연변과정중，쌍향토공격책시양각부분연변발전병불균균，최종적응변치위4％～5％，여단향토공격책상비쌍향토공격책연변속솔발전교만。채용개이문천련모형대격책수축시험과정진행모의，건립료묘술토공격책점탄소성수축변형적수학방정，병대시험결과진행료의합，의합효과량호。
In this paper ,the 1000h creep tests were conducted on two kinds of polypropylene bidirectional geogrid under a same stress level .The shrinkage measure ment was done after the creep tests and complete unloading .T he test results show that ,in the process of the creep ,the de‐velopment of is creep for the geogrid specimens is nonuniform ,and the final strain of bidirectional geogrid is about 4% ~5% ,which is less than that of uniaxial geogrid .On the other hand ,by using the Kelvin model and other models to simulate the process of the shrinkage tests ,an equation was established to describe the shrinkage of the geogrid .The experimental data were fitted with the e‐quation and the result is good .